Lisa Simpson remains a vegetarian as a promise from the show's staff to Paul McCartney
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The Simpsons is one of the most successful animated television shows of all time. It is so prominent that Paul McCartney once made a guest appearance on it--or rather his cartoon likeness did. McCartney provided his own voice though and had a stipulation before he agreed to the guest spot.
He wanted one of the show's characters, Lisa Simpson, to be a vegetarian. McCartney himself is a longtime vegetarian. He also stipulated that her change to vegetarianism had to be a permanent one on the show.
